Indicating mechanism.



H. Y. NORWOOD.

INDICATING MECHANVISM.

APPLICATION FILED MAR. 17, 1914.

1,250,209. Patented Dee. 18,1917.

STATES PATENfr OFFICE.

HARRY Y. NORWOOD, OF ROCHESTER, NEW YORK, ASSIGNOR TO TAYLOR INSTRUMENT COMPANIES, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

INDICATING MEGHANISM.

Srpecication of Letters Patent. Patented Dec. 18, 1917.

Application led March 17, 1914. -Serial No. 825,408.

' devices for indicating temperature by giving an alarm or signal of some sort when the temperature reaches a predetermined point, and it has for its purpose to improve the construction of such mechanisms by affording an arrangement of parts that will successfully withstand the various tests to which the machine may be subjected. A more spe'- cific and further object of my invention is to improve the construction of the contact member or members with which the circuit closer cooperates, so that the latter will not be liable to any. strain in coming into engage- To these and other ends the invention consists. of certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being` pointed out in the claim at the end of the specificaz tion.

In the drawingi v Figure 1 is a plan view of an apparatus fconstructed in accordance with a preferred embodiment of my invention, and

Fig. 2 1s a sectlonal view on the line ?Similarrreference characters throughout the views indicate the same parts.

' vIn the present embodiment-of the invenjr tion, A indicates an electrical circuit including the battery B and the indicator or alarm device C. The circuit is connected with a box or casing which contains the tempera'- ture controlling mechanism, and is normally open until the temperature reaches a predetermined point, whereupon the circuit-` isv closed by means which will presently be described. D is the box or casing referred to, preferably constructed of metal and thereby affording a conducting medium. d

and d are binding posts arranged on vthe casing D and to which the circuit A is connected, the binding post d being insulated from the casing by suitable insulating material, d3. A conductor d4 leads from the binding post da to a pair of contact members or arms d5 and d, `vhich are pivotally mounted upon standards or posts dfand d8. The contact arms d5 and ai include outer end portions Which are insulated from theirinner ends, and lie in the pathof the circuit closer to be described presently. The contact arms are thus movably supported Iand are connected by yieldable means, preferably in the form of a spring d", which serves to normally draw vthem together. The movement of the contact members toward each other is limited yby suitable stop devices which are preferably adjustable and` to this end I pro= Vide a pair of threaded posts d10 and 0311, adjustably mounted on standards d and 0313, and. having insulated ends or caps d and d cooperating with legs or extensions elle and du on the contact members. d .is the circuit closer which may be provided lwith suitable pins or projections dw for engagement with the contact members, and it is suitably mounted upon a heat controlled f changeable device adapted to be controlled i by certain varying conditions. In the present instance, it comprises a flexible coil that f is hollow and contains an expansible fluid depending for its action upon the temperay tureto which it is subjected. The coil E is delicately constructed, and can not safely be subjected to any undue strain, such as would occur if the circuit closer, whichit carries, engages a rigid and fixed contact, particularly if the parts are under the iniiuence of an abnormal temperature. It is for this purpose thatI have provided means for permitting the contact to yield, and thus enable further movementI of the circuit closer when operated by excessive temperatures,while at the same time permitting the parts to operate under normal conditions in an eilicient and accurate manner. By means of the ad- When the latter is actuated to engage either operate. In case .the circuit closer is actuatedby an excesslve temperature, sufficient .to move it beyond the normal position of ,the Contact member, the latter-Will yield and permit such movement, the spring d being of a very light character'rv and offering but `slight resistance to the force eXerted by the circuit closer.

I clalm as my invention. The combmation With ac 1rcu1t closer movable in opposite directions to alternately engage a pair of Contact members, said contact members being pivotally mounted and arranged on opposite sides in the path of and normally spaced from the circuit closer, yieldable means connected to the contact members actuating them toward each other and permitting abnormal movement laway from each other, and adjustable stop devices coperating With and limiting the movement of the contactmembers toward each other.

HARRY Y. NORWOOD.

Witnesses:

C. B. CAESIN, C. A. HAAK. 

